Billionaire hedge fund manager Bill Ackman revealed on Friday that his activist investment firm has bought up approximately $2 billion worth of shares of Uber — sending the ride-share company ...

Bill Ackman expects privatization of Fannie Mae will provide a huge catalyst for the stock. However, Wall Street analysts are concerned any privatization attempts will fail. The uncertainty makes ...

Billionaire investor Bill Ackman pledged to cover the legal fees for a Texas doctor in a dispute with UnitedHealth Group Inc. over her claims that the company asked her to scrub out of an ...